If your humidity is staying under 60 I think you will be ok until you get back. I have had a bad thermostat that I had to replace and currently I can get several degrees difference in various rooms. But to be save seems like you need someone to verify that the A/C is running and cooling the home. For now ask your friend to turn the temp down to say 70. Then see that the fan comes on in the heater and that the outside air compressor is working. That may answer your question. Espically if the temp does not start dropping.
On my heater their is a peep hole that I can look into the heater and see the current code. The code could be a good or bad one and they may change. Your friend can try and find the peep hole. Look up the manual on the internet for what the codes mean.
My guess is you might have a bad condenser (outside unit) and this is rather easy to fix. I am guessing this as your unit is not too old.
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